"Unable to resolve the name" error with "readmatrix" command

I am trying to import an excel file using the "readmatrix" command, but I am receiving the error: "Unable to resolve the name filename.xlsx." I have tried both in the command window and in a script. How to I make this command work?

[Mitchell Thurston]

What's the name of your excel file?

[John Skiles]

Thanks, I figured it out; the set path was not set up correctly.